Custom EventEmitter for Javascript

EventEmitter.js

class EventEmitter {
  constructor() {
    this.listeners = []
  }
  
  addListener(event, listener) {
    this.listeners.push({ event, listener })
  }
  
  removeListener(event, listener) {
    this.listeners = this.listeners.filter(l => !(l.event == event && l.listener == listener))
  }
  
  removeAllListeners(event = null) {
    this.listeners = this.listeners.filter(l => event && l.event != event)
  }
  
  emit(event, data) {
    this.listeners.filter(l => l.event == event).forEach(l => l.listener(data))
  }
}

var eventEmitter = new EventEmitter()
var listener = data => {
  console.log({ data })
}

eventEmitter.addListener('onChange', listener)
eventEmitter.emit('onChange', 'Renan')
eventEmitter.removeListener('onChange', listener)
eventEmitter.emit('onChange', 'Coelho')

// { data: 'Renan' }